In the expansion of (x2 + 3x + 2) 5, the coefficient of X is () A. 160B. 240C. 360D. 800

In the expansion of (x2 + 3x + 2) 5, the coefficient of X is () A. 160B. 240C. 360D. 800

The term containing x in (x2 + 3x + 2) 5 expansion is expanded by five polynomials. When expanded by polynomial multiplication, only one polynomial gives 3x, and the other four give 2. In the expansion, the coefficient of X is c51.3.24 = 240, so the option is B